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chromium/third_party/blink/web_tests/external/wpt/html/rendering/replaced-elements/embedded-content/cross-domain-iframe.sub.html 

<!doctype html>
<html class="reftest-wait">
<title>Rendering of iframe element with src attribute from another domain</title>
<link rel="match" href="cross-domain-iframe.sub-ref.html">
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#embedded-content-rendering-rules">
<meta name="assert" content="Checks that iframe content is correctly rendered even if it is retrieved from a different domain.">
<iframe id=myframe src="http://{{domains[www1]}}:{{ports[http][0]}}/images/green.png"></iframe>
<script>
  myframe.onload = () => {
    requestAnimationFrame(() => {
      requestAnimationFrame(() => {
        document.documentElement.classList.remove('reftest-wait');
      });
    });
  }
</script>
</html>